Secondary-battery plate.



- Paten ted Feb. [8, m2.

w. LFS ILVEY.

SECONDARY BATTERY PLATE.

(Application 'flled 11111.10, 1901.)

(No Model.)

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UNITED STATES PATENT OFFICE,

\VILLIAM L. SILVEY, OF DAYTON, OHIO.

SECON DARY-BATTERY PLATE.

SPECIFICATION formingpart of Letters Patent N 0. 693,453, dated February 18, 1902.

Application filed January 10,1901. stun NO. 42,759. on model.)

provements in Secondary-Battery Plates; and

I do hereby declare the following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to electrodes for secondary batteries and to that class of electrodes comprising crimped or corrugated strips formed into coiled plugs and fixed in holes in a coil-sustaining plate or frame by upsetting their ends. Its object is to produce an efficient and durable electrode, and more particularly to produce coiled plugs formed of strips having receptacles of uniform and equal width and depth filled with an adherent active material ready for subsequent use in the electrolyte of battery-cells.

Referring to the accompanying drawings, which are made a part hereof, in which similar letters refer to similar parts, Figure 1 is a front of a side elevation of a battery-plate A with two perforations or holes init filled with conductive andactive elements. Fig. 2 is an edgeview of a plate. Fig. 3 is a broken or cross section of Fig. 1 along the dotted line X X, but with the conductor Bremoved. Fig. 4 is a corrugated conductor-strip B,a

. filling 0 being illustrated, for convenience, as

applied to only'a part of the strip. Fig. 5 is an edge view of the strip and filling shown in Fig. 4:. Fig. 6 is a conductor-strip B rolled up ready to be inserted in the plate A. Fig. 7 is a section of" the plate A and conductorstrip B in position along the dotted line X X of Fig. 1. Fig. 8 is a section of the battery plate A with conductor-strip B and filling O in position along the dotted line Z- Z of Fig. 1. Fig. 9 is an end view of a rolled-up conductor-strip B,Fig. 6,fillcd with'finely-divided leadcompound O.

It will be observed that I have onlyshown enough holes in the battery-plate A toillusa good practice to taper these holes to the center from each side and after inserting the conductor B in place to upset it, as shown in Figs. 2, 7, and 8, by means of which a more perfect electrical contact is maintained and the plugs are also firmly keyed into position. This upsetting is confined to the outer convolutions of the coiled'plug to .avoid disturbing the equal and uniform distribution of the 7 corrugated, so as to present a uniform crosssection, the corrugations being uniform in size and elevation. This-provides for the easy introduction of the active material and for its even and uniform distribution. In some cases I spread these corrugated strips with a compound of lead made into a paste, so as to fill up the corrugations, as shown at one end of Figs. 4: and 5. I then roll the corrugated and filled strip into a button. The

button is then inserted into thefplate A, as

shown in Fig. 8. The filling for the plugs is composed of a mixture of metallic lead particles and oxid of lead made intoa paste with water or a mixture of water and an acid.

The strips B after being combined with the.

filling C are next pickled ina solution of acid and water to harden the filling and make it more adherent and at the same time sulfate the filling, changing .the metallic lead into sulfate of lead and also acting 011' any oxids that may be present. This toa'large-extent prevents expansion during subsequent galvanic action. It is evident that the active filling C may be applied in a dry powdered state'by pressing it into. the sheet 'by'hydraulic'poweror otherwise. The fixing and pickling are doneb'efore the plugs are in:

serted in the hole, at which. time the filling is hard and adherent and the forming process.

. ready to undergo V I I do not confine'myself to any particular I proportion of mixturejof acid and water. I L

That I claim as new, and wish to secure by Letters Patent of the United States, is-

1. In a storage battery, the combination of a corrugated conducting-strip with an external covering for the strip of a mixture of oxid of lead, powdered metallic lead and a liquid, said covering for the strip filling the grooves between the corrugations and presenting practically uniform parallel sides, the strip thus made being wound into a spiral plug and inserted into a conductor-plate, as set forth.

2. In a storage battery, the combination of a corrugated conducting-strip with an exter nal covering for the strip of a mixture of oxid of lead, powdered metallic lead and a liquid, said covering for the strip filling the grooves between the corrugations and presenting practically uniform parallel sides, the strip thus made being wound into a spiral plug and inserted into a conductor-plate, said filled plugs projecting beyond the faces of the plate, as set forth.

3. In a storage battery, the combination of a corrugated conducting-strip with an external covering for the strip of a mixture of oxid of lead, powdered metallic lead and a liquid, said covering for the strip filling the grooves between the corrugations and presenting practically uniform parallel sides, the strip thus made being wound into a spiral plug, pickled, and subsequently inserted into a conductor-plate, as set forth.

4. The combination of a battery-plate having holes therein, a corrugated strip having its corrugations filled with active material whereby the filled strip has a practically uniform thickness, said filled strip being subsequently wound into a spiral to form a button and inserted in the plate.

5. In a storage battery, the combination of a corrugated conducting-strip with an external covering for the strip of a mixture of oxid of lead and powdered metallic lead, said covering filling the grooves between the corrugations and presenting practically uniform parallel sides, the strip thus made being wound into a spiral plug, pickled, and subsequently inserted into a conductor-plate, as set forth.

In testimony whereof I have set my hand in the presence of two subscribing witnesses.

WVILLIAM IA- SILVEY.

Witnesses:

EARL LONES, D. P. HAMER. 

